She has power over heat transfer and, to a degree, fire.
In heat transfer by direct contact, of course, color doesn't matter at all.
Heat transfer takes place from this array and through side walls.
The two are put in close physical contact over a large surface area to maximize heat transfer.
You can look them up in text books on "boiling heat transfer."
The driving force for heat transfer is temperature, not internal energy.
Please refer to a text on heat transfer for more information.
I'm inclined to believe it is heat transfer, but not in the way they imagine.
So, if you have two materials at the same temperature, there is no driving force for heat transfer.
Thermal analysis is also often used as a term for the study of heat transfer through structures.